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//===- TestPrintDefUse.cpp - Passes to illustrate the IR def-use chains ---===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mlir/IR/BuiltinOps.h"
#include "mlir/Pass/Pass.h"
using namespace mlir;
namespace {
/// This pass illustrates the IR def-use chains through printing.
struct TestPrintDefUsePass
: public PassWrapper<TestPrintDefUsePass, OperationPass<>> {
MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestPrintDefUsePass)
StringRef getArgument() const final { return "test-print-defuse"; }
StringRef getDescription() const final { return "Test various printing."; }
void runOnOperation() override {
// Recursively traverse the IR nested under the current operation and print
// every single operation and their operands and users.
getOperation()->walk([](Operation *op) {
llvm::outs() << "Visiting op '" << op->getName() << "' with "
<< op->getNumOperands() << " operands:\n";
// Print information about the producer of each of the operands.
for (Value operand : op->getOperands()) {
if (Operation *producer = operand.getDefiningOp()) {
llvm::outs() << " - Operand produced by operation '"
<< producer->getName() << "'\n";
} else {
// If there is no defining op, the Value is necessarily a Block
// argument.
auto blockArg = cast<BlockArgument>(operand);
llvm::outs() << " - Operand produced by Block argument, number "
<< blockArg.getArgNumber() << "\n";
}
}
// Print information about the user of each of the result.
llvm::outs() << "Has " << op->getNumResults() << " results:\n";
for (const auto &indexedResult : llvm::enumerate(op->getResults())) {
Value result = indexedResult.value();
llvm::outs() << " - Result " << indexedResult.index();
if (result.use_empty()) {
llvm::outs() << " has no uses\n";
continue;
}
if (result.hasOneUse())
llvm::outs() << " has a single use: ";
else
llvm::outs() << " has " << result.getNumUses() << " uses:\n";
for (Operation *userOp : result.getUsers()) {
llvm::outs() << " - " << userOp->getName() << "\n";
}
}
});
}
};
} // namespace
namespace mlir {
void registerTestPrintDefUsePass() { PassRegistration<TestPrintDefUsePass>(); }
} // namespace mlir
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